I'm currently planning a mount for the Mountain High CFFC-048 oxygen bottle in my RV-10 tailcone. Trying to think of things that could interfere with my mounting location, and the worst offender I've seen is the pitch servo. Can anyone with a Dynon setup tell me how far the servo overhangs the bellcrank ribs?

Here is the area I'm talking about, and some relevant documentation. It looks to be around 3.5", but I can't tell how far up off the bottom that is. Could really use some pictures, my searches were in vain.

I'd suggest you re-think this. Most -10's can exceed the aft cg limit if you're not careful. Put the oxygen in the baggage area. If the baggage area is full, then the tank in the tailcone will most likely put you aft of cg limits. Some builders find a way to put the tank on top of the tunnel, between the front seats, just to keep the cg from going too far aft.

Another vote for not putting it in the tailcone for CG reasons. I have a portable bottle (Mountain High CFFC-022 with O2D2 units) and I put it between the rear seats on top of the tunnel. This allows me to easily remove the bottle when not required.

Not to worry, the battery cables are secured well away from the tank. That was just an early wiring test. I weighed the idea of putting it in the baggage compartment but didn't want to compromise that area. Besides, the tank is extremely light compared to the AC unit and autopilot servos. Since I knew my panel is going to be relatively heavy with the G900X, not to mention AC compressor on the engine and metal constant speed prop, I'm not anticipating unusual CG problems (just the usual ones). Notice that I built a custom battery box for a 28V battery and even so, the relays are well away from the system. The servo on the other side was much closer, though it would have worked. It was the AC unit that was the conflict.

Not sure why everybody is so against this. How many people have 2 PC680s in the tailcone? I plan on two batteries back there, but switching just one of them to EarthX is enough to offset the weight of the bottle. Almost two of these bottles in fact, ignoring mounting hardware, valves,tubing.

Not sure why everybody is so against this. How many people have 2 PC680s in the tailcone? I plan on two batteries back there, but switching just one of them to EarthX is enough to offset the weight of the bottle. Almost two of these bottles in fact, ignoring mounting hardware, valves,tubing.

Not sure why everybody is so against this. How many people have 2 PC680s in the tailcone? I plan on two batteries back there, but switching just one of them to EarthX is enough to offset the weight of the bottle. Almost two of these bottles in fact, ignoring mounting hardware, valves,tubing.

"So against" is pretty strong. I think what people, including myself, are saying, is that sooner or later you are likely to have a loading situation where the weight is within limits, but the cg is too far aft. Every pound you move forward now will lessen that problem. But the choice is yours. And, of course, if you have more weight forward than average (heavy prop, compressor, heavy pilot?) then you may have no cg problem at all. But that's not typical.

The Mountain High bottle (AL682) comes with a nice carry pouch and tie down straps. I cut the straps such that I had two crisscross straps (using the four strap that came with it) that hold down the bottle in the pouch on top of the tunnel between the front and rear seats. The four strap ends go under existing tunnel screws.

Simple, easy to reach behind and turn on from the pilot's seat, easy to get in and out for refill and provides an arm rest for the rear passengers. I used just half of this bottle for an extended trip out west over the mountains.

Side note - five of us at the airpark went in on a O2 refill set up. Five bottles in a daisy chain so the lowest bottle is used first. The last four refills cost me a total of $40 (the price to exchange an empty for a full bottle at the local supplier).

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